Trump in new attack on US hacking intel
He said on Twitter that an intelligence briefing he was due to receive on alleged Russian interference in the 2016 election - which is said to have benefited Mr Trump - had been delayed.
"Perhaps more time needed to build a case. Very strange!" he wrote.
But US intelligence officials insisted there had been no delay in the briefing schedule.
Several US agencies including the FBI and the CIA believe Russia directed hacks against the Democratic Party and the campaign of its presidential candidate Hillary Clinton, releasing embarrassing information through Wikileaks and other outlets to help Mr Trump win the election.
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Mr Trump initially dismissed the claims as "ridiculous" but subsequently said he would meet US intelligence chiefs to be "updated on the facts of this situation".
Wikileaks founder Julian Assange said once again on Tuesday that Russia was not the source for the site's mass leak of emails from the Democratic Party in the run-up to the US presidential election.
In another development, Mr Trump's pick for secretary of state, Rex Tillerson, has agreed he will cut all ties with Exxon Mobil and comply with conflict-of-interest requirements.
Meanwhile, Republicans have ditched a plan to gut the independent body that investigates political misconduct after a backlash.
The lawmakers' surprise vote to strip the Office of Congressional Ethics of its independence prompted public uproar and a dressing down from Mr Trump on Twitter.
The secretive move, which overshadowed the first day of the 115th Congress, was reversed in an emergency meeting.
The ethics body was set up in 2008 following a slew of scandals that resulted in several House lawmakers being jailed.
Mr Trump made cleaning up corruption in Washington a key theme of his campaign.
Republican Speaker of the House Paul Ryan had argued unsuccessfully against the rule change, which was adopted on Monday night in a closed-door meeting.
As the news spread, internet searches for "who is my representative" rocketed, according to Google Trends.
House Republicans called an emergency meeting and abruptly voted to undo the change.
Mr Ryan - who was re-elected by fellow lawmakers on Tuesday as House Speaker - had urged his party to seek bipartisan support and to wait to push for the change later.
Mr Trump's remarks about US intelligence agencies and the ethics committee came on a busy day for the president-elect's Twitter account.
He also warned North Korea about its nuclear ambitions, attacked Obamacare costs and sparked a row with General Motors over its manufacturing operation in Mexico, which the car firm disputes.
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